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Apps with 'Single Line Diagram' feature
diagrams.net (previously draw.io) is a free online diagram drawing application for workflow, BPM, org charts, UML, ER, network diagrams. Powerful vector graphics editor for the office with tools for easily creating charts, diagrams, brochures and more. bSmart GIS is a web-based GIS application software. It contains over 350 features and tools that can be used for Geo-spatial data management as well as analysis, image processing. For Electricity, Water, Gas, Telecom and Renewable Energy.